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參數(shù)資料
| 型號： | L4989 |
| 廠商： | 意法半導體 |
| 英文描述： | LOW POWER VOLTAGE REGULATOR |
| 中文描述： | 低電源電壓調節(jié)器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 584K |
| 代理商： | L4989 |
5/10
L4989
WATCHDOG
WEn
VOLTAGE REGULATOR
The voltage regulator uses a p-channel MOS transistor as a regulating element. With this structure a very
low dropout voltage at current up to 150mA is obtained. The output voltage is regulated up to transient
input supply voltage of 40V. No functional interruption due to over-voltage pulses is generated.
The voltage Regulator is always active and not depending on the state of WEn input pin.
A short circuit protection to GND is provided.
Figure 1. Behavior of output current versus regulated voltage Vo
Pin
Symbol
Parameter
Test condition
min
typ
max
Unit
Wi
Vih
Input high voltage
Vs=13.5V
3.5
V
Wi
Vil
Input low voltage
Vs=13.5V
1.5
V
Wi
Vih
Input hysteresis
Vs=13.5V
500
mV
Wi
Rwi
Pull down resistor
Vs=13.5V
30
100
250
k
Vcw
Vwhth
Low threshold
Vs=13.5V
10%
13%
16%
V
o_ref
Vcw
Vwlth
High threshold
Vs=13.5V
44%
47%
50%
V
o_ref
Vcw
Icwc
Charge current
Vs=13.5V, Vcw=0.1V
5
10
20
μ
A
Vcw
Icwd
Discharge current
Vs=13.5V, Vcw=2.5V
1.25
2.5
5
μ
A
Vcw
Twop
Watchdog period
Vs=13.5V, Ctw=47nF
20
40
80
ms
Res
twol
Watchdog output low time
Vs=13.5V, Ctw=47nF
4
8
16
ms
Pin
Symbol
Parameter
Test condition
min
typ
max
Unit
WEn
V
WEn_low
WEn input low voltage
1
V
WEn
V
WEn_high
WEn input high voltage
3
V
WEn
V
WEn_hyst
WEn input hysteresis
600
920
1300
mV
WEn
R
WEn
Pull down current
Vs=13.5V
1
2.5
5
μ
A
Vo
Vo_ref
Iout
Ishor
t
Ilim
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